CVE-2019-10063

Flatpak before 1.0.8, 1.1.x and 1.2.x before 1.2.4, and 1.3.x before 1.3.1allows a sandbox bypass. Flatpak versions since 0.8.1 address CVE-2017-5226by using a seccomp filter to prevent sandboxed apps from using the TIOCSTIioctl, which could otherwise be used to inject commands into thecontrolling terminal so that they would be executed outside the sandboxafter the sandboxed app exits. This fix was incomplete: on 64-bitplatforms, the seccomp filter could be bypassed by an ioctl request numberthat has TIOCSTI in its 32 least significant bits and an arbitrary nonzerovalue in its 32 most significant bits, which the Linux kernel would treatas equivalent to TIOCSTI.